Mickey2

I think this is a line of machines inspired by the early Necchi BUs, and yours might have a few built in stitches, but just guessing by the extra lever "N". It might be another type of setting.

To start with, you have to clean and oil to make sure the functions work properly. Any sluggis or stuck part in the movements are likely to affect the functions adversely. Take the top of the machine, unscrew needle plate (throat plate), top of the machine and face plate (might be hinged). All gears, joints and hinged parts where metal moves against metal need oil. Take out the bobbin case, hook and race, clean, scrape the feed dogs clean with a tooth pick if they are grubby. The machine looks clean.

Vertical lever should in theory be stitch legth setting with reverse. The lever with LMR is needle position. The lever above the the small "W" should be stitch width. Z and N levers might have someting to do with buttonholer function, stitch patterns or cam functions if there are any. The turn nob on the bed is feed dogs settings (up, middle, dropped).

Play around with the levers and you will discover the basic functions, and I'm sure a manual will turn up with a bit of search.

Double and tripple check threading; needle in the correct way (it might go in only one way), check top tension; thread goes inbetween the tension disks.